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+===== Z80 =====
+  * [[http://stackoverflow.com/questions/387654/why-is-there-no-z80-like-ldir-functionality-in-c-c-rtl/388442#388442|Fast blanking screen]]
+  * [[https://www.worldofspectrum.org/forums/discussion/41834/redirect/p1|Z80 CPU emulation test]]
+  * [[http://clrhome.org/asm/|Online IDE and assembler for Z80]]
+  * [[https://www.worldofspectrum.org/forums/index.php?p=discussion/41704/scf-ccf-flags-new-discovery|SCF CCF flags discovery]]
+  * [[https://shred.zone/cilla/page/389/optimizations.html|Optimizations]]
+==== Basic2Asm ====
+  * ZIP v2.6 - anmeldt i YS85 - jan93. Side 22 - https://worldofspectrum.net/infoseekid.cgi?id=0013816
+==== Multiface Stuff ====
+  * Genie
+  * Lifeguard
+==== GDB support ====
+Sådan kan man få en gdb med Z80 support:
+<code>
+git clone https://github.com/legumbre/gdb-z80.git
+cd gdb-z80
+./configure --enable-werror=no --target=z80-unknown-coff
+make MAKEINFO=true
+sudo make MAKEINFO=true install
+ls /usr/local/bin/z80-unknown-coff-{gdb,gdbtui}
+ddd --debugger z80-unknown-coff-gdb &
+</code>
+==== RND ====
+<code>
+; Generate a Random Number
+; ------------------------
+; The pseudo random number is generated by: (Last_Random_Number * $43) + $01FD
+; Exit: HL=Random number ($0000-$FFFF).
+;       A=Random number ($00-$FF, the low byte of HL).
+L4098:  LD   A,(L4084)                          ; Fetch the last random number.
+        LD   C,A
+        LD   L,A
+        LD   H,$00
+; Generate HL=Last_Random_Number * $40
+        LD   B,$06
+L40A1:  ADD  HL,HL
+        DJNZ L40A1
+; Generate HL=Last_Random_Number * $43
+        ADD  HL,BC
+        ADD  HL,BC
+        ADD  HL,BC
+; Generate HL=(Last_Random_Number * $43) + $01FD
+        LD   BC,$01FD
+        ADD  HL,BC
+        LD   A,L
+        LD   (L4084),A                          ; Store the new random number.
+        RET
+</code>